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Found 350 results

  1. Hello. I am working on the NL buckling of a composite panel (geometric NL implicit) and I successfully setup the model and ran the analysis within radioss after automatic conversion from the optistruct input. The problem is that although I specify I need 50 increments (NINC) with PW convergence criteria, the solution ALWAYS converges at 25 increments and of course the total buckling is not captured. Below is my NLPARM card from the .fem file. I am not specifying anything else in the NLPARM card or in any other cards. Can you please help? NLPARM 6 50 0.0 6 50 PW + 0.01 0.01 20 + 1.0 Thank you
  2. Skill.Leo0

    Engine run not starting

    Hi, I downloaded the neon model from Altair University and tried reducing it to below 100,000 nodes to use it with a student edition. However, I am facing an issue with the engine file. The engine run just doesn't start. The engine run seems to begin with the Software titles and then these lines appear. ROOT: test RESTART: 0001 NUMBER OF HMPP PROCESSES 8 14/02/2019 ==== End of solver screen output ==== ==== Job completed ==== I am attaching the file where I am facing this issue. Any hint on what's wrong? I was also trying to create a few sections. They might have gone wrong but even if I delete those problematic entities, this file just doesn't run. neon_front_0001.rad neon_front_0000.rad
  3. Hi Everyone, I am working with Radioss. I use TYPE 7 contact for this model. I wanted to check whether my model is working regarding with displacement or stress result for my BCs. But after analysis result it shows nothing every displacement result is zero and low Stress (Can see animation in this link https://drive.google.com/drive/folders/1jccvEqdd7xk5u3Zi_QyirAPrZYkpptGM). Before created this topic, I learnt RD-T3530 and RD-T3595. Can anyone take a look into my model whats wrong or what change I have to make. Thank you in advance. Animation : https://drive.google.com/drive/folders/1jccvEqdd7xk5u3Zi_QyirAPrZYkpptGM Regards, Salaya
  4. I I found this problem many times. I am not sure that happen because of the boundary conditions or anything else. And I imported model Optistruct file in Radioss solver, Is it ok or not? Thank you for helping!
  5. Hi, I've done a form simulation in Hyperform and I would like to import the .sta file in a new simulation made with radioss block, but when I run the second simulatio an error occours. The error is: ERROR ID : 1101 ** INPUT ERROR DESCRIPTION : CANNOT OPEN INCLUDE FILE SOLUTION : PLEASE CHECK IF INCLUDE FILE LIES IN THE DIRECTORY Could someone halp me? Thank you in advance
  6. Hello all , I have created a laminate with around 28 plys and now I want to reflect the laminate and also the plys, what is the best way to do it? Thanks
  7. Now you can download the PDF format of Radioss Reference Guide, User Guide and Tutorial from this Forum. RADIOSS_2017_Reference_Guide.pdf RADIOSS_2017_Tutorials_and_Examples.pdf RADIOSS_2017_User_Guide.pdf
  8. Hi, I have a question about boundary condition setting for this work. Assume this is a chassis of truck and fixed. 1) How to set contact between surface and surface? 2) How to fixed? I need to applied load to this plate with 0-100kN in 5 sec of time 3).How to applied? I tried the example but don't understand. I make this with myself don't have adviser. I would like you to help me, Thank you.
  9. Hi, can someone share the model files of RD-E: 5400 Cut Methodology from Radioss example guide? The files were supposed to be in the following folder, however no such folder in my installation directory.
  10. ビーム要素では軸力のほか曲げ、ねじり、せん断が働きます。要素の局所座標では、長さ方向がX軸ですが、Y軸を決めるために要素外の第3節点を指定します。       そのプロパティ/PROP/BEAMでは、断面積および断面2次モーメントを定義します。材料則では、トラスト同様、弾性(/MAT/LAW1)と弾塑性(/MAT/LAW2)のみ用いる事が出来ます。弾塑性材料を用いる場合、その降伏判定は、その断面力から直接、 により、判定されます。         ビーム要素ではこれとは別に、断面上に複数の積分点を設け、それぞれの位置と積分点が代表する面積を指定する事で、実際の断面形状を模擬する、積分型ビーム/PROP/INT_BEAMも用意されています。こちらのビーム要素では、降伏判定は積分点毎に行われ、それらの応力から断面力が計算されます。材料則では、弾性(/MAT/LAW1)と弾塑性(/MAT/LAW2)に加え、表形式の弾塑性(/MAT/LAW36)も用いる事が出来ます。         
  11. 自由度数の2乗で演算量が増えて行く陰解法とは異なり、陽解法では自由度数に比例してしか演算量は増えないため。陽解法のモデル化では、簡略化するのでは無く、シェルやソリッドで出来るだけ忠実に形状を再現して解こう、という文化がありますが、やはりトラスやビームのような1次元の要素で簡易的にモデル化したい、という場合もあります。 このため、使える材料則等、機能は限られますが、トラスやビーム要素も用意されています。 トラス要素は、2節点でその長さ方向を定義する軸力だけが作用する一定断面の要素です。そのプロパティ/PROP/TRUSSで断面積を定義します。材料則では弾性(/MAT/LAW1)と弾塑性(/MAT/LAW2)のみ用いる事が出来ます。
  12. AlessandroC

    Composite sandwich panel

    Hi to everyone, I would like to produce a crash between a composite sandwich panel and a fixed cylindrical rigid wall. The first one is made of three different materials defined as LAW25 (COMPSH), plies as Type19 and laminate panel as P17_stack. Unfortunately something do not work properly. Can anyone help me to understand where I made mistakes? composite_panel_radioss_0000.rad result.mvw
  13. himalagrawal

    Fatigue Analysis cyclic loading

    I was doing fatigue analysis on a model and I cant find the option for cyclic loading while defining the loading history. Also the units of my model are mm,g,s which gives stree units in pascals so should I define everthing in pascals including the ultimate tensile strength? Also in the load time history should the input be time and forces or time and g(acceleration) values?
  14. Hi All, I want to create 2 solid blocks touching each other and bolted together. I meshed them and when I import the same in Hypercrash and checked for intersections, it shows me an intersection. I have tried to resolve this by Remove intersections option or 3D mesh editing, but could not remove this intersection. Can you please help me how to remove such intersections and corresponding penetration. Thanks in advance. Regards Nitin Jain
  15. Sunilshanmugam

    Initial Penetrations In Interface

    Hi Guys, Im doing frontal collision using radioss, spot weld and adhesives were provided using connectors. Since there were interferences between spot weld and adhesives as shown in the figure. Both spot and adhesives will be there in model, is it advisable to continue with this. Since my major interferences and penetrations is between spot and adhesives. Can you provide me a better solution. Also while providing type7 contact, Case1 In my model both shell and solid part persists i have directly selected those parts in Master Entity and Case2 In my model , i have created skin for all solid parts with a thickness of 0.01mm and updated those in Master entity along with shell parts in this which one is advisable, how to establish contact for those solid components.
  16. Hi , I´m Javi from Spain. I´ve some problems with a Radioss Analysis and after searching during a whole day in the Altair Forum I didn´t find a solution. 1) Radioss has hidden all the BCS and CLOAD but even clicking on Show or touching the graph options I´m not able to view in the graphics area the constraints and loads. 2) When I ran the model, it takes a lot of time to solve it and the energy error is too high. I read that it might be because of the penetration or high deformation but I don´t think my model has a high displacement field. My model is a dynamic force test with AL7075-T6, and it tries to solve a piece attached to a chassis with the force of the shocks applied from 0 to its maximum value (I´m doing all in 2 seconds, ie: 0N in T=0, 500N in T=0.5s … Fmax at T=x and F=0N at Tstop, all of this in a Force curve) Could you check the model and tell me If I´m doing something wrong? I´m going nut because of these 2 problems and I´m trying to solve it through the forum and the manual but I´m not able to do it. Thank you very much ! Kind Regards, Javier ARS-support-A1-v2-Forum.hm
  17. marta

    Composites - Radioss

    Hi everyone, I have to simulate an object made by thermoplastic composite laminate. I know that I have to do a model calibration with a fitting of experimental curves but I have a lot of doubts about the correct procedure. For exemple on the one element test I have to define laminate and plys or I have to use a single ply with laminate's thickness? Could anyone send me some material about composites model calibration? Thanks in advance. Marta
  18. Hello All, Greetings!! I am using mm, kg, ms units system in HyperCrash and using Mat Law 36 or PLAS_TAB for different parts. Therefore I have taken strain rate unit as 1/ms. But general standard unit for the strain rate is 1/sec. Therefore I ran simulation with units as 1/sec as well. Results: Simulation results of Strain rate with 1/sec units are closer to experimental results as compare to 1/ms simulation results. Above screen shot is from Radioss_10.0_Reference_Guide2. Please guide me what unit (1/sec or 1/ms) to use for accurate material modelling in Radioss. Thanks and Regards Nitin Jain
  19. Dario Alonso

    DYREL CARD and MODEL VALIDATION

    Good evening, I am making a Formula SAE impact attenuator simulation. It is make with carbon fiber prepreg. For the model we are using material LAW 25 (CRASURV) and property 17 (stack). To calibrate material parameters and boundary conditions we are simulating an small plate. During the impact we obserb a shock wave that brakes the plate wherever and not row by row. We are trying to include something to damp or relax the material avoiding the shock wave. However, when we use the control cad /DYREL the model stops and kinectic energy evolve to cero. Parameters used on /DYREL are relaxation factor = 1 (default) and period (6e-5). We obtain period following indications of this text (https://insider.altairhyperworks.com/wp-content/uploads/2012/01/DynamicRelaxation_1201.docx). Where is our mistake? What can we try to solve it? Moreover, we create a model to compare with a test made in our center 2 years ago. Real part have a maximum of 10 plies. To obtain the same results on our hypermesh model we have to use more than 70 plies. We have asked Altair Spain and they don't see any mistake on the model (Attached you can find the model) and recomend us to ask on the forum. Real test results were positive and the impact attenuator resist impact and there was 16 cm without brake. On the model the impact totaly brakes and can't stop the 300 Kg rigid body used to simulate the car. Thank you for your help modelo ingenia SI.hm
  20. harshitpuri

    Shear failure in bolt

    i am trying to simulate shear failure in bolt in which head of bolt tears off due to shear load. I've used type 13 spring along with a local co-ordinate system and pre-tension curve . What is the best way to capture shear load failure. and what is the best way to apply pretension type 32 or type 13 spring. Should washers be modeled as rigid.?
  21. Pavan Kumar

    ERROR

    THE error is increasing what to do ? NC= 9000 T= 8.4895E-01 DT= 9.4325E-05 ERR= -5.6% DM/M= 0.0000E+00
  22. Radiossのソリッド要素は、6面体のヘキサ要素と4面体テトラ要素です。5面体のペンタ要素が必要な場合には、ヘキサ要素を縮退させて用います。ヘキサ要素では1次8節点ソリッドと、2次20節点ソリッドがあります。8節点ソリッドでは、デフォルトは古典的アワグラスコントロールの1点積分要素ですが、物理アワグラスコントロールの要素(HEPH)、完全積分要素も選択できます。これらはソリッドのプロパティで定式を指定します。テトラ要素では4節点テトラ要素と2次10節点テトラ要素を用いる事が出来ます。4節点テトラはデフォルトでは1点積分の1次要素ですが、プロパティでItetra=1 を指定する事で、各節点に回転自由度を導入した1節点6自由度の4節点2次テトラ要素とする事も出来ます。この要素では中間節点がありませんので、通常の2次要素の様な安定限界のΔTの低下なしに、精度の向上を図る事が出来ます。 ソリッドのプロパティでは、その使用目的(等方性、異方性)に応じて、以下のようなプロパティタイプが使用出来ます。 /PROP/SOLID:等方性ソリッド要素 /PROP/SOL_ORTH:直交異方性ソリッド要素 ソリッドプロパティ内で指定する、主なオプションは以下の通りです。 Isolid:ヘキサソリッド要素の定式化を指定 0:1点積分ソリッド要素(デフォルト、/DEF_SOLIDが指定されている場合はその値)、古典的アワグラスコントロール 24:HEPHソリッド要素、1点積分、物理アワグラスコントロール 17: 2×2×2完全積分ソリッド要素 Itetra:4節点テトラ要素の定式化を指定 0:1積分点の1次テトラ要素 1:1節点6自由度。4積分点の2次テトラ要素 Iframe:大回転の取り扱いに関するフラグ 0:非共回転定式化(デフォルト、/DEF_SOLIDが指定されている場合はその値) 2:大回転を取り扱う共回転定式化
  23. Radiossのシェル要素は4節点の4角形要素と3節点の3角形要素です。昔は、4節点シェルを縮退させて、3角形として用いる事も行われていましたが、現在では使われません。4角形要素の定式のデフォルトは、古典的なアワグラスコントロールに基づく、BT(Belytschko-Tsai)要素ですが、物理アワグラスコントロールの要素(QEPH)や2×2積分の完全積分要素(Batoz)も使用出来ます。これらはプロパティで指定します。3角形要素のデフォルトはC0 3角形要素です。1点積分ですが、アワグラスは無い要素です。但し、硬めの傾向を示す要素であるため、4角形と3角形のシェル要素を混在させてモデル化を行う際は、精度を重視するのであれば3角形要素は10%以下にするのが望ましいと言われています。完全積分の3角形要素(DKT18)も使用出来ます。 シェルのプロパティでは、その使用目的(等方性、異方性、複合材、積層等)に応じて、以下の様なプロパティタイプが使用出来ます。 /PROP/SHELL:等方性シェル要素 /PROP/SH_ORTH:直交異方性シェル要素 /PROP/SHCOMP:複合材シェル要素 /PROP/SH_SANDW:サンドウィッチ積層シェル要素 /PROP/SH_FABR:異方性繊維シェル要素 シェルプロパティ内で指定する、主なオプションは以下の通りです。 Ishell:4角形シェル要素の定式化を指定 0:BTシェル要素(デフォルト、/DEF_SHELLが指定されている場合はその値)、 1点積分、古典的アワグラスコントロール 24:QEPHシェル要素、1点積分、物理アワグラスコントロール 12:Batozシェル要素、完全積分 Ish3n:3角形シェル要素の定式化を指定 0:C0三角形シェル要素(デフォルト、/DEF_SHELLが指定されている場合はその値) 30:DKT18シェル要素、完全積分 Idrilll:面内回転自由度のフラグ 0:面内回転自由度なし、1節点5自由度のシェル要素 1:Optistructと同様の面内回転自由度を持つ1節点6自由度のシェル要素 N:板厚方向の積分点数 0:積分点を設けず、断面力から直接計算します(デフォルト)、降伏条件には以下のIllyusin条件で行われます。     ここに、、 精度的には3点の積分点程度 1~10:板厚方向の積分点数。1は膜要素として用いる場合 Thick:板厚の値 Ithick:板厚変化を考慮するかどうかのフラグ 0:板厚変化は考慮せず(デフォルト、/DEF_SHELLが指定されている場合はその値) 1:板厚変化を考慮 Iplas:塑性計算手法のフラグ 0:ラジアルリターン(デフォルト、/DEF_SHELLが指定されている場合はその値) 1:Newton-Raphson法による反復計算
  24. Hello Altair Community! I would like to model a so called "bighead" insert which is laminated between the plies of a composite plate. I want to simulate the rip out and measure the force etc. So how can I model properly this problem? I attached an image where you can see how I want to model this insert. Should I use solid or shell element? If I use ply-based modeling I can not find a way to model a bighead between plies. Thank you for your answer in advance!
  25. 陽解法の有限要素法では、要素の計算の全計算時間に占める比率が高くなることから、その計算時間を抑える為の工夫がいろいろと取り入れられていますが、弾塑性計算におけるラジアルリターン(Radial Return)アルゴリズムもその一つと言えます。塑性理論によれば、降伏後の応力点はその降伏関数上に無ければいけませんが、それをきちんと計算しようとすれば収束計算が必要になります。これに対し、ラジアルリターンでは、まず、弾性として応力の増分を計算し、計算された応力が降伏条件を超えた場合には、降伏関数上への戻り量を近似的に計算して、それを差し引いて新たな応力値とするものです。収束計算を行いませんので計算時間はより少なくできますが、精度的には下がります。これが今でもデフォルトですが、より高精度な計算を行いたい、という要望から現在ではNewton-Raphson法による反復収束計算も選択できるようになっています。これはプロパティのIplas(2:ラジアルリターン、1:反復収束計算)で選択できます。
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